In the requirements section it shows-
QUOTE
Files and Directories
Required - In order to function correctly phpBB needs to be able to access or write to certain files or directories. If you see “Not Found” you need to create the relevant file or directory. If you see “Unwritable” you need to change the permissions on the file or directory to allow phpBB to write to it.
cache/:
Found, Unwritable
files/:
Found, Unwritable
store/:
Found, Unwritable
Optional files and directories
Optional - These files, directories or permission settings are not required. The installation system will attempt to use various techniques to create them if they do not exist or cannot be written to. However, the presence of these will speed installation.
config.php:
Found, Unwritable
images/avatars/upload/:
Found, Unwritable
Required - In order to function correctly phpBB needs to be able to access or write to certain files or directories. If you see “Not Found” you need to create the relevant file or directory. If you see “Unwritable” you need to change the permissions on the file or directory to allow phpBB to write to it.
cache/:
Found, Unwritable
files/:
Found, Unwritable
store/:
Found, Unwritable
Optional files and directories
Optional - These files, directories or permission settings are not required. The installation system will attempt to use various techniques to create them if they do not exist or cannot be written to. However, the presence of these will speed installation.
config.php:
Found, Unwritable
images/avatars/upload/:
Found, Unwritable
See, those folders are being shown as "Unwritable".
How can I edit the permissions to make them writable?
I don't understand these things(see attachment)
Pl. explain which ones to select and one to be deselected.